i. Alternative diagnosis for cause of dyspnea, increased sputum or cough ii. Patients who requires intubation at time of recruitment iii. Patients who are unable to give consent iv. Patients who are pregnant or could be pregnant or are currently breast-feeding v. Women of child-bearing age who cannot use methods of contraception as described in the consent, including condoms, female condoms, cervical caps, diaphragms, and intra uterine devices.